Sun. Water. Life.
BERNT LORENTZ GmbH & Co. KG Kroegerskoppel 7, 24558 Henstedt-Ulzburg, Germany, Tel. +49 (0) 4193 7548 - 0, Fax - 29, www.lorentz.de
All specifi cations and information are given with good intent, errors are possible and products may be subject to change without notice. Pictures may
differ from actual products depending on local market requirements and regulations.
v120918
8
7 Automatic Control For Full-Tank Shutoff
We recommend the use of a float switch or other means
to prevent overflow of your tank. This will stop the pump
when the tank is full, then reset when the level drops. This
conserves ground water, prevents overflow, and eliminates
unnecessary pump wear. PS controllers allow the use of
small signal cable to a remote float switch, even if the tank
is a long distance away.
Float switch requirements
1. A switch must be used, not wet electrodes.
2. The preferred system requires a float switch to MAKE
contact on rise to turn the pump OFF. This is called
“normally open” (N.O.). It may be commercially la-
beled as a “pump down” switch, but here it works in
reverse, to allow pumping up.
Wiring to the controller The controller offers two op-
tions for connection of a remote switch. These allow the
use of either a “normally open” (N.O.) or a “normally
closed” (N.C.) switch. “Normal” refers to the status of the
contacts when the switch is DOWN and calling for water.
Wiring a “normally closed/reverse action switch”
Connect the switch to termins 4 and 5. Closing (connect-
ing) the switch turns the pump ON
Float switch cable requirements
1. Two wires are needed.
2. Minimum wire size #18 AWG (1mm²). This is good
for a distance as far as 2,000 feet (600 m).
3. The cable must be suitable for its environment.
4. If it must run a long distance, use twisted-pair shield-
ed cable to reduce the chance of damage from light-
ning-induced surge.
Grounding shielded float switch cable If you use
shielded cable, connect the shield to ground AT THE CON-
TROLLER ONLY. DO NOT ground the shield at the float
switch. This will reduce surges induced by nearby lightning.
sealed
cable clamp
position
pump off
pumping
range
position
pump on
cable
weight
float switch
UP: closed
DOWN: open
normal: open
if cable is shielded,
ground this end only
UP: open
DOWN: closed
normal: closed
if cable is shielded,
ground this end only
float switch
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